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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
NET LOSS	$ (214.0)	$ (197.5)	$ 407.3	$ (188.0)	$ (203.1)	$ (142.9)	$ (150.1)	$ (140.5)	$ (192.2)	$ (636.6)	$ (304.2)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									(21.7)	0.0	0.0
Net change in fair value of derivatives									1.6	(9.7)	8.5
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									8.3	(1.0)	0.4
Other									(0.2)	(0.5)	0.7
NET OTHER COMPREHENSIVE INCOME (LOSS)									(12.0)	(11.2)	9.6
COMPREHENSIVE LOSS									(204.2)	(647.8)	(294.6)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(5.8)	(3.1)	0.5
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									$ (210.0)	$ (650.9)	$ (294.1)

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